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1.1 This Prestandard specifies messages for electronic information exchange between computer systems used by healthcare parties for the purposes of updating Supporting information that is attached to code values within a coding scheme. In particular, this message is intended to provide information to clinicians that are requesting tests within the specialties of: - haematology, - clinical chemistry, - cytology, - biochemistry, - immunology. 1.2. This Prestandard provides a description of a message which provides sufficient information to allow a receiving system to associate supporting information to code values representing laboratory investigations that may be performed on samples taken from the patient. The requirements for the supporting information have been validated solely against those investigations that are within the scope of ENV 1613, Messages for Request and Report of Laboratory Investigations. The supporting information may include any or all of the information items relating to: (a) the sampling procedure, including volume/mass of sample required, sample container, sample treatment, etc. (b) any information that should accompany the sample such as age, sex, cycle, height, weight, etc. (c) any advice to the patient. (d) any patient preparation procedures, etc In addition, the supporting information may provide information about the suppliers of the laboratory services.